docs: def embed_data_in_blockchain(data, private_key,
          blockchain_client=BlockchainInfoClient(), fee=OP_RETURN_FEE,
          change_address=None, format='bin'):
      """ Builds, signs, and dispatches an OP_RETURN transaction.
      """
      # build and sign the tx
      signed_tx = make_op_return_tx(data, private_key, blockchain_client,
          fee=fee, change_address=change_address, format=format)
      # dispatch the signed transction to the network
      response = broadcast_transaction(signed_tx, blockchain_client)
      # return the response
      return response